Physics – Plasma Physics
Scientific paper
Feb 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004jgra..10902210y&link_type=abstract
Journal of Geophysical Research, Volume 109, Issue A2, CiteID A02210
Physics
Plasma Physics
13
Magnetospheric Physics: Plasma Waves And Instabilities, Magnetospheric Physics: Plasma Sheet, Magnetospheric Physics: Magnetotail, Magnetospheric Physics: Storms And Substorms, Space Plasma Physics: Waves And Instabilities
Scientific paper
The present article discusses the stability of the thin current sheet against lower-hybrid-drift (LHDI) and modified-two-stream (MTSI) instabilities. It is demonstrated that MTSI is driven by the cross-field current, implying that MTSI should also be most effective at the neutral sheet, while LHDI is driven by the density gradient, which is maximized near the edge of the current sheet. It is shown that under a normal Harris current sheet condition, Vi/|Ve| = Ti/Te, LHDI completely dominates MTSI, which implies that linearly unstable current-driven modes cannot penetrate to the center of the Harris current sheet. However, if the Harris current sheet condition is relaxed to Vi/|Ve| > Ti/Te, then MTSI is shown to gradually overtake LHDI. This finding indicates that cross-field drift linear instability dominated by MTSI feature may be operative at the center of the ion-dominated thin current sheet.
Lui Anthony Tat Yin
Yoon Peter H.
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